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Key Features
- Bidirectional Conversion: CSV → JSON and JSON → CSV in one tool
- Custom Delimiters: Support for comma, semicolon, tab, pipe, and custom separators
- Header Row Detection: Automatically converts first row to JSON object keys
- Type Auto-Detection: Intelligently converts numbers, booleans, and null values
- Pretty Print JSON: Optional formatting with indentation for readability
- Nested Object Flattening: Handles complex JSON structures when converting to CSV
- 100% Browser-Based: All processing happens client-side—your data stays private
Common Use Cases
- Convert Excel or Google Sheets CSV exports to JSON for API consumption
- Transform database query results to JSON for JavaScript processing
- Create CSV reports from JSON API responses for spreadsheet analysis
- Migrate data between systems with different format requirements
- Generate test fixtures by editing CSV in Excel then converting to JSON
- Prepare bulk import data by converting JSON to CSV for database tools
How to Use
1. Select conversion direction: CSV → JSON or JSON → CSV using the mode tabs 2. Paste your CSV or JSON data into the input editor (or upload a file) 3. Configure options: delimiter type, header row handling, and output formatting 4. Enable Auto Convert for real-time results, or click Convert manually 5. Copy the converted output or download it as a .json or .csv file 6. Use Load Example to see sample conversions for each direction
Created by Sofyan Setiawan – Full-Stack Developer
Software engineer with 8+ years of experience building web applications, developer tools, and API integrations. Creator of CodingTool.dev, helping developers with everyday coding tasks.